Steam-boiler.



No. 826,820 PATENTED- JULY 24, 1906. D. AHBRN;

STEAM BOILER. APPLIUATIQN I IIED APB. 10. .1906.

rHl Nmuus PETER: Co.. wAsHmaroN, n. c.

DENIS AI-IERN, OF NEW YORK, N. Y.

STEAllll-*BOILERl Specification o f Letters Patent.

Patented Jury' 24, 1906.

Application filed April 10, 1906. Serial No. 310,898.

To a/ZZ whom it may concern: j

Be it known that I, DENIs AHERN, a citi- -zen of the United States,residing in the city of New York, borou h of Manhattan, in the countyand State of ew York, have invented a certain new and useful Improvementin Steam-Boilers, of which the following is a specification.

The invention relates to boilers of the type shown in United StatesLetters Patent to me, dated June 19, 1894,No. 521,532, inwhichthe bodyof the boiler is rectangular in cross-section, set with its diagonals inhorizontal and vertical lines, and filled with tubes extending indiagonal lines between opposite plane faces.

The object of the present invention is to simplify the construction,lessen the cost of manufacture, and increase the efliciency of theboiler.

The invention consists in certain novel features, details ofconstruction, and arrangements of parts, by which the above objects areattained.

The accompanying drawings form a part of this specification and show theinvention as it has been carried out.-

Figure 1 is a side view with a ortion of the casing removed to show theboi er and one of the furnaces. Fig. 2 is a corresponding front viewwith the boiler-front removed, partly in vertical section. Fig. 3 is avertical section Ashowing a modification of the steam-chamber,

and Fig. 4 is avertical section showing a modified form of thefeed-heating portion of the apparatus.

Similar letters of reference indicate like parts in all the figures.

Referring to Figs. 1 and 2, A is the main rectangular portion or body ofthe boiler, A is an upward extension from the upper angle, serving as asteam drum or chamber, and A2 is a similar, but preferably longer,downward extension or water-leg from the lower angle. B is an inclosingcasing for the sides of the boiler and furnaces extending horizontallyabove to the steam-chamber, and B B2 are respectively the boiler-frontand corresponding casi-ng for the rear. with fire-doors and as usual.counterpart of the other, one on each side of the water-leg, forming onewall thereof. The grate-bars E extend nearly the full length of theboiler and are supported at the rear on a masonry wall B3 or otherwiseand at the front The former is equipped ash-pit doors B4 and B5,

There are two furnaces each the on a bearing-b ar E', carried at one endby the water-leg and at the other by a water-pillar G, to be described.The sides of the boiler, steam-charnber, and water-leg are each a singleplate of steel or boiler-iron,- joined at the upper edge to a strip orseparating-piece A3, forming the top of the steam-chamber, and

, to a similar strip A4 at the lower edge, forming the bottom of thewater-leg. The faces of the steam-chamber and water-leg are vertical andparallel and sustainedl by stay-bolts A5. The opposite faces of thelbody A are diagonal and parallel and are joined by diagonally-extendingtubes A, secured toy the shell by expanding as usual, arranged invertical rows, each row crossing the next adjacent at an an le. A7 A7are heads for the body, each a sing e plate slightly dished and set withthe convex face outward. The heads of the steam-chamber and water-legare narrow plates AS A8, lapped upon and riveted at the ends to slightextensions of the main heads A7, as at A". As before stated, the casingB joins the steam-chamber A near the top, and it is provided on eachside thereof with an opening b, surrounded by the base of a stack F,straddling the upper part of the steamchamber and permitting the escapeof the products of combustion from the furnaces. i is a flue-dampermounted in the stack on a shaft F2 close to the upper face of thesteamchamber, operated by a lever F3 and arranged to swing from side toside or tcassume a central vertical position, by which either or bothopenings b ma offer free passa' e for the gases from the rnaces tol thestac.

The angles at the sides of the body are rounded, as shown, and attachedthereto at the front and rear on each side are water-pillars G, eachpreferably ahollow steel casting set vertically and serving with thewater-leg tosupport the boiler. Each pillar is shaped t to match therounded angle of the boiler and is provided with an exterior flange G',lapped upon and riveted to the upper inclined face of the body and witha hand-hole G2, through which the interior rivets G3 are set in joiningthe pillar to the lower inclined face. Op osite the hand-hole G2 anopening is drilled and tapped through the inner wall of the pillar andthe angle of the boiler, in which is screwed a thimble G4, through whichwater may circulate between the interior of the boiler and the pillar.At the front faces of the forward pillars and the back faces of the rearpillars near the lower ends are hand- IOO IOS

-'each fire-space C and D. ward pillars support the outer ends of therthe feed-.pipes H is forced into -connected to the casing B on holes G5for cleaning purposes, and at any convenient points on such faces areconnections H to feed-water pipes H, also connected, as at H2, to thewater-leg, so that circulation of water between the pillars and waterlegmay take place. The pillars on each side of the boiler are joined byhorizontal pipes G6, each series extending from near the top to amasonry wall forming the outer side of Lugs on the for- Water enteringthrough the pillars near the bottom, a ortion also entering thewater-leg at H2 and ows upward, circulating through the pipes G, exposedto the heat of bearing-b ars E.

- the furnace, and enters the body of the boiler at a high temperaturethrough the thimbles The pillars also serve as corner-supports for thecasing B and boiler-front.

J J 2 are long horizontal gates pivotally the interior and arranged whenlowered to lie upon the upper faces of the body and close the longopenings or passages C D between the boiler and the casing on each sideand when raised to afford free passage for the gases therethrough fromthe fire-spaces C D to the heat-chambers C2 D2 above. The gates areoperated by chains J, extending through openings b in the casing andserve with the flue-damper F in directing the hot gases from thefurnaces through the tubes and around the body of the boiler. As shownin Fig. 2, the furnace `D alone is in operation, the gate J 2 is closed,the gate J is open,

and the damper F is thrown to the le Thus the gases from the .furnace Dpass diagonally upward from right `to left through the tubes A into theheat- 40- .open gate J and passage C into the iirelspace C aboveitheidle grate,

chamber C2, thence downward through the diagonally upward through theoppositely-inclined tubes into the heat-chamber D2 and through theopening b to the stack, bathing the body of the boiler on four sides andmaking two complete traverses therethrough, besides bathing both facesof the water-leg. By reversing the positions of the gates and damper thefurnace C may be fired in like manner. By closing both gates and settingthe Hue-damper in the vertical position both furnaces may be operatedwhen extremely rapid steaming is necessary, the gases in such casepassing through the boiler-tubes and escaping to the stack on oppositesides.

Water and steam gages, blow-0H connections, safety-valve, water-column,and other usual boiler equipments will be understood to be supplied, andthese, with other parts and accessories omitted or not fully shown, maybe of any ordinary or approved types. By making the sides of theboiler-bod steam-chamber, and water-leg of two single rectangular platesthe cost of construction and horizontal,

and the liability to leakage is lessened. By the arrangement of gatesand damper with double furnaces the consumption of fuel may be closelyproportioned to the steam requirements, resulting in fuel economy. Thewater-pillars serve to support the boiler, and

-f by their water-tube connections the heatingsurface andsteam-producing qualities are increased. p

Modifications may be made in the forms and proportions without departingfrom the spirit of the invention, and parts may be used without thewhole.

A cylindrical steam-drum, as at A10 in Fig. 3, may be set upon thesteam-chamber, if preferred, and. the water-pillars with their tubesomitted, or simple coils G7, as in Fig. 4, or pipes having return bendsmay be substituted therefor and connected to the body and water-leg atconvenient points. I prefer the whole as shown.

l. In a boiler having a body of rectangular cross-section set with itsdiagonals vertical and horizontal, and a steam-chamber and water-legextending respectively upward and downward from the upper and lowerangles thereof, water-pillars each comprising a hollow casting securedto the horizontal angles of such body on each side thereof at the frontand rear, thimbles extending from the interior of said pillars at theirupper ends to the interior of said body, horizontal tubes between thewater-pillars of each side, and pipe connections from the lower ends ofsaid pillars to said water-le 2. In a boilerll aving a body ofrectangular cross-section set with its diagonal vertical and asteam-chamber and water-leg extending respectively upward and downwardfrom the upper and lower angles thereof, a grate on each side of saidwater-leg, a casing inclosing said body, grates, and Water-leg andextending to said steam-chamber to form two furnaces one for each sideof the boiler, a stack communicating with each of said furnaces throughopenings in said casing, boiler-tubes extending from the lower angularfaces of said body to the upper opposite faces thereof, and means forcontrolling said openings whereby said furnaces may be firedindependently or together, substantially as and for the purposesspecified.

3. In a boiler having a body and a steamchamber and water-leg extendingrespectively upwardly and downwardly therefrom, a firespace on each sideof said water-leg, a casing inclosing said body, fire-spaces andWater-leg and extending to said steam-chamber to form two furnaces onefor each side of the boiler, each having a fire-space below andheatchamber above connected by a passage between said body and casing,openings in said casing on each side of said steam-chamber and leadingfrom said heat-chambers to a stack,

IIO

ISO

i of each furnace through said body to the heati cross-section set withlts' diagonals vertical boiler-tubes extending from the fire-space andhorizontal, and a steam-chamber and water-leg extending respectivelyupward and downward from the upper and lower angles thereof, a ire-spaceon each side of said wa- 3 5 ter-leg, a casing inclosing said body,firespaces, and water-leg and extending to said steam-chamber to formtwo furnaces one on each side of the boiler, each having a lirespacebelow and a heat-chamber above con- 4o nected by a passage between theside angle of said body and said casing, a stack above saidsteam-chamber communicating With the heat-chamber of each furnacethrough openchamber of the other, means for controlling saidstack-openings, and means for controlling said passages, whereby saidfurnaces may be fired independently or together, substantially as andfor the purposes specified.

4. In a'boiler havingla body of rectangular and horizontal, and asteam-chamber and water-leg extending respectively upward and downwardfrom the upper and lower angles thereof, a fire space on each side ofsaid water-leg, a casing inclosing said body, firespaces and water-legand extending to said steam-chamber to form two furnaces one for eachside of the boiler, each having a firespace below and heat-chamber aboveconnected by a passage between the side angle of said body and saidcasing, a stack communicating with the heat chamber of each furnacethrough openings in said casing, boiler-tubes extending from thefire-space of each furnace through said body to the heat-chamber of theother, means for controlling said stack-openings, and means forcontrolling said passages, whereby said furnacesmay be firedindependently or together, substantially as and for the purposesspecified.

5. In a boiler having a body of rectangular cross-section set with itsdiagonals vertical chamber, boiler-tubes extending from the fire-spaceof each furnace to the heat-chamber of the other, a swinging flue-damperin said stack constructed to open either of said openings and close theother or to open both 5o together, and pivoted gates controlling saidpassages, and operating means therefor, whereby said furnaces may befired independently or together substantially as and for the purposesspecified. 55 In testimony that I claim the invention above set forth Iaffix my signature in presence of two witnesses.

DENIS AIIERN. Witnesses:

CHAs. A. HAUCK, CHARLES R. SEARLE.

ings in said casing on each side of said steam- 45

